Marangoni convection at droplet interface during gas-liquid mass transfer

被引：0

作者：

Lin, Handan ^{[1
]}

Jiao, Fangjian ^{[1
]}

Yu, Guangxiong ^{[1
]}

Yan, Jun ^{[1
]}

Sha, Yong ^{[1
]}

机构：

[1] Department of Chemical Engineering and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian

来源：

Huagong Xuebao/CIESC Journal | 2013年 / 64卷 / 08期

关键词：

Interface turbulence; Marangoni convection; Mass transfer; Single droplet;

D O I：

10.3969/j.issn.0438-1157.2013.08.021

中图分类号：

学科分类号：

摘要：

By sweeping binary droplets with N2 gas, the Marangoni convection driven by desorption of light component into gas phase is observed with the help of laser shadowgraph optical method. The results show that Marangoni convection arises as small-scale vortex and large-scale symmetrical circular flow. The small-scale vortex structure appears in the ethanol-water droplet at the very beginning, and then vortex structure develops and merges to form larger vortex flow. At the interface of acetone-water binary droplet, symmetrical circular flow appears at first, and then vortex flow arises in the circular flow. For the quiescent single binary droplet composed of ethanol-water and acetone-water separately, the mass transfer coefficient is measured to compare with theoretical prediction while N2 gas purges the gas-liquid interface. Experimental results show that the large-scale symmetrical circular inside the droplet can promote mass transfer process much better than the small-scale vortex near the interface of droplet. © All Rights Reserved.

引用

页码：2846 / 2852

页数：6

共 18 条

[1] Sha Y., Li Z., Lin F., Shadowgraph observation of the interfacial turbulence phenomena in the gas-liquid mass transfer, CIESC Journal, 61, 4, pp. 844-847, (2010)
[2] Sha Y., Ye L., Unordered roll flow patterns of interfacial turbulence and its influence on mass transfer, J. Chem. Eng. Japan, 39, 3, pp. 267-274, (2006)
[3] Linde H., Velarde M.G., Waldhelm W., Interfacial wave motions due to Marangoni instability, J. Colloid Interface Sci., 236, 2, pp. 214-224, (2001)
[4] Pertler M., Haberl M., Rommel W., Mass transfer across liquid-phase boundaries, Chem. Eng. Proc., 34, 3, pp. 269-277, (1995)
[5] Shi Y., Eckert K., Orientation-dependent hydrodynamic instabilities from chemo-Marangoni cells to large scale interfacial deformations, Chinese J. Chem. Eng., 15, 5, pp. 748-753, (2007)
[6] Kim M.C., Choi Ch.K., Yoon D.Y., Chung T.J., Onset of Marangoni convection in a horizontal fluid layer experiencing evaporative cooling, Ind. Eng. Chem. Res., 46, 17, pp. 5775-5784, (2007)
[7] Imaishi N., Fujinwa K., Hozawa M., Interfacial turbulence in gas-liquid mass transfer, Int. Chem. Eng., 22, 4, pp. 659-665, (1982)
[8] Sun Z.F., Yu K.T., Wang S.Y., Absorption and desorption of carbon dioxide into and from organic solvents: effects of Rayleigh and Marangoni instability, Ind. Eng. Chem. Res., 41, 7, pp. 1905-1913, (2002)
[9] Lu H.-H., Yang Y.-M., Maa J.-R., Effect of artificially provoked Marangoni convection at a gas/liquid interface on absorption, Int. Chem. Eng. Res., 35, pp. 1921-1928, (1996)
[10] Wegener M., Grunig J., Stuber J., Transient rise velocity and mass transfer of a single drop with interfacial instabilities-experimental investigations, Chem. Eng. Sci., 62, pp. 2967-2978, (2007)

← 1 2 →